At this Denver landmark, the meals are compulsory, the sopapillas are complimentary, and the insanity is everywhere.

A house carved into a rock in the 1940s.

An inconspicuous footbridge beloved by San Diego locals.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

The subtle science of a master molecular gastronomist.

This lake in the Cascades lives up to its name, disappearing down a hole every spring.

St Bernard de Clairvaux Episcopal Church, better known as one of the oldest European buildings in the Western Hemisphere.

A popular swimming hole that hides one of America's most deadly diving spots.

European castle ruins in an American state park are actually the product of death and grief.

A wondrous old library overlooking the nation's capital.

This ruined fort hidden at the top of Central Park can't seem to keep from losing its historical plaques.

Finale of "William Tell Overture" can be heard as drivers pass over grooves in the road.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

Stripes of flowers bloom each spring in a 50 acre rainbow of color.

Historic marionette theater features thousands of handmade puppets and free cups of ice cream.

A historic neighborhood church is reborn as a psychedelic arts collective.

House of vintage taxidermy and Steampunk sculptures in a quiet Pittsburgh neighborhood.

A religious-themed park filled with folk art to bring biblical stories to life that fell into disrepair and now being restored.

This naturally-sourced hot spring is now home to a clothing-optional resort.

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

The world's longest known cave system.

A modernist landscape of water and sci-fi concrete.

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

Established in the '60s, a family-owned tropical drink bar founded by Ray Buhen, bartender to the stars.